# NTSB Accident DEN04CA143
> **Robinson R22 Beta 2** · 2004-09-16 · Spanish Fork, UT, USA · MINR
## Event
- **NTSB number:** DEN04CA143
- **Event ID:** 20050209X00166
- **Type:** Accident
- **Date:** 2004-09-16
- **Location:** Spanish Fork, UT, USA
- **Coordinates:** 40.141387, -111.661109
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 1
- **Total aboard:** 2
## Aircraft
- **Make:** Robinson
- **Model:** R22 Beta 2
- **Registration:** N7533E
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

the pilot's failure to maintain adequate rotor rpm during a practice autorotation, and the flight instructor's improper flare. A contributing factor was the instructor's inadequate supervision of the pilot.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN04CA143) · AI Analytics · CC0 1.0*